# # U.S. Geological Survey # National Water Information System # Retrieved: 2024-05-05 07:27:08 EDT # # ---------------------------------- WARNING ---------------------------------------- # Some of the data that you have obtained from this U.S. Geological Survey database # may not have received Director's approval. Any such data values are qualified # as provisional and are subject to revision. Provisional data are released on the # condition that neither the USGS nor the United States Government may be held liable # for any damages resulting from its use. # # More data may be available offline. # For more information on these data, contact USGS Water Data Inquiries. # This file contains the annual peak streamflow data. # # This information includes the following fields: # # agency_cd Agency Code # site_no USGS station number # peak_dt Date of peak streamflow (format YYYY-MM-DD) # peak_tm Time of peak streamflow (24 hour format, 00:00 - 23:59) # peak_va Annual peak streamflow value in cfs # peak_cd Peak Discharge-Qualification codes (see explanation below) # gage_ht Gage height for the associated peak streamflow in feet # gage_ht_cd Gage height qualification codes # year_last_pk Peak streamflow reported is the highest since this year # ag_dt Date of maximum gage-height for water year (if not concurrent with peak) # ag_tm Time of maximum gage-height for water year (if not concurrent with peak # ag_gage_ht maximum Gage height for water year in feet (if not concurrent with peak # ag_gage_ht_cd maximum Gage height code # # Sites in this file include: # USGS 01646000 DIFFICULT RUN NEAR GREAT FALLS, VA # # Peak Streamflow-Qualification Codes(peak_cd): # 1 ... Discharge is a Maximum Daily Average # 2 ... Discharge is an Estimate # 3 ... Discharge affected by Dam Failure # 4 ... Discharge less than indicated value, # which is Minimum Recordable Discharge at this site # 5 ... Discharge affected to unknown degree by # Regulation or Diversion # 6 ... Discharge affected by Regulation or Diversion # 7 ... Discharge is an Historic Peak # 8 ... Discharge actually greater than indicated value # 9 ... Discharge due to Snowmelt, Hurricane, # Ice-Jam or Debris Dam breakup # A ... Year of occurrence is unknown or not exact # Bd ... Day of occurrence is unknown or not exact # Bm ... Month of occurrence is unknown or not exact # C ... All or part of the record affected by Urbanization, # Mining, Agricultural changes, Channelization, or other # F ... Peak supplied by another agency # O ... Opportunistic value not from systematic data collection # R ... Revised # # Gage height qualification codes(gage_ht_cd,ag_gage_ht_cd): # 1 ... Gage height affected by backwater # 2 ... Gage height not the maximum for the year # 3 ... Gage height at different site and(or) datum # 4 ... Gage height below minimum recordable elevation # 5 ... Gage height is an estimate # 6 ... Gage datum changed during this year # 7 ... Debris, mud, or hyper-concentrated flow # 8 ... Gage height tidally affected # Bd ... Day of occurrence is unknown or not exact # Bm ... Month of occurrence is unknown or not exact # F ... Peak supplied by another agency # R ... Revised # # agency_cd site_no peak_dt peak_tm peak_va peak_cd gage_ht gage_ht_cd year_last_pk ag_dt ag_tm ag_gage_ht ag_gage_ht_cd 5s 15s 10d 6s 8s 33s 8s 27s 4s 10d 6s 8s 27s USGS 01646000 1935-09-06 810 7.03 USGS 01646000 1936-06-13 2890 10.58 USGS 01646000 1937-04-26 1760 8.88 USGS 01646000 1937-10-28 2890 10.64 USGS 01646000 1939-01-30 1040 7.36 USGS 01646000 1940-04-20 1170 7.71 USGS 01646000 1941-04-05 685 6.49 USGS 01646000 1942-03-31 634 6.24 USGS 01646000 1942-10-16 2820 10.50 USGS 01646000 1943-11-09 1550 8.50 USGS 01646000 1945-08-01 1450 8.26 USGS 01646000 1946-05-18 1170 7.68 USGS 01646000 1947-08-21 682 6.42 USGS 01646000 1948-06-20 1300 8.05 USGS 01646000 1948-12-04 1000 7.30 USGS 01646000 1950-07-16 1760 8.90 USGS 01646000 1951-06-14 1660 8.88 USGS 01646000 1952-09-01 1940 9.17 USGS 01646000 1952-11-21 1760 8.90 USGS 01646000 1953-12-14 748 6.59 USGS 01646000 1955-08-13 2960 10.70 USGS 01646000 1956-07-21 3190 10.96 USGS 01646000 1957-05-14 1220 C 7.85 USGS 01646000 1957-12-21 1820 C 9.05 USGS 01646000 1959-09-02 1080 C 7.54 USGS 01646000 1960-08-05 1550 C 8.49 USGS 01646000 1961-04-13 1120 C 7.60 USGS 01646000 1962-03-12 1170 C 7.69 USGS 01646000 1963-06-30 1350 C 8.08 USGS 01646000 1964-01-09 1120 C 7.59 USGS 01646000 1965-03-05 1220 C 7.82 USGS 01646000 1966-09-14 1710 C 8.84 USGS 01646000 1967-08-25 6610 C 13.18 USGS 01646000 1968-09-10 2030 C 9.37 USGS 01646000 1969-07-23 3360 C 10.97 USGS 01646000 1970-04-14 1440 C 8.30 USGS 01646000 1971-02-14 1850 C 9.07 USGS 01646000 1972-06-22 32200 C 21.40 USGS 01646000 1973-04-27 1740 C 8.86 USGS 01646000 1973-12-21 1120 C 7.59 USGS 01646000 1975-09-26 7770 C 13.82 USGS 01646000 1976-01-01 2160 C 9.59 USGS 01646000 1976-10-09 1080 C 7.46 USGS 01646000 1978-01-26 3480 C 11.11 USGS 01646000 1979-09-06 3960 C 11.54 USGS 01646000 1979-10-01 3000 1,8,C USGS 01646000 1981-07-04 1200 C 7.80 USGS 01646000 1982-06-13 1500 C 8.41 USGS 01646000 1983-04-15 1920 C 9.21 USGS 01646000 1984-03-29 1770 C 8.96 USGS 01646000 1985-02-12 1990 C 9.33 USGS 01646000 1986-04-16 689 C 6.42 USGS 01646000 1987-09-08 1490 C 8.41 USGS 01646000 1988-05-19 4310 C 11.75 USGS 01646000 1989-05-06 6810 C 13.31 USGS 01646000 1989-11-16 1000 C 7.31 USGS 01646000 1990-10-23 3050 C 10.89 USGS 01646000 1992-04-22 1560 C 8.55 USGS 01646000 1993-03-04 1840 C 9.09 USGS 01646000 1993-11-28 4720 C 12.04 USGS 01646000 1995-01-20 1110 C 7.58 USGS 01646000 1996-01-19 3660 C 11.25 USGS 01646000 1996-10-19 2570 C 10.15 USGS 01646000 1998-03-21 3030 C 10.51 USGS 01646000 1999-09-16 1680 C 8.42 USGS 01646000 2000-04-17 1650 C 8.37 USGS 01646000 2001-08-11 4830 C 12.03 USGS 01646000 2002-04-28 1240 C 7.54 USGS 01646000 2003-09-23 4400 C 11.71 USGS 01646000 2003-12-11 5070 C 12.20 USGS 01646000 2005-03-28 3170 C 10.66 USGS 01646000 2006-06-26 01:30 10200 C 15.01 USGS 01646000 2006-11-16 4270 C 11.61 USGS 01646000 2008-09-06 14300 C 16.62 USGS 01646000 2009-05-26 2270 C 9.43 USGS 01646000 2010-08-18 2520 C 9.94 USGS 01646000 2011-09-08 19:15 17000 C 17.54 USGS 01646000 2011-10-13 2100 C 9.15 USGS 01646000 2012-10-30 2650 C 9.99 USGS 01646000 2014-04-30 5610 C 12.57 USGS 01646000 2015-07-09 2300 C 9.38 USGS 01646000 2016-05-03 1840 C 8.53 USGS 01646000 2017-07-29 05:52 2010 C 8.86 USGS 01646000 2018-07-22 01:07 6270 C 12.99 USGS 01646000 2019-07-08 13:51 8170 C 12.95 USGS 01646000 2020-04-13 16:15 2310 C 8.71 USGS 01646000 2021-09-01 10:00 3550 C 9.71 USGS 01646000 2021-10-25 23:52 2480 2,C 8.69 USGS 01646000 2022-12-23 01:15 2320 C 8.51